Contrary to what Intel roadmaps had previously indicated, Intel today officially announced the Intel Core 2 Quad processor. The Core 2 Quadro moniker that was designated earlier appears to have been changed at the last minute, as launch material from late September 2006 claimed the official product name would be Core 2 Quadro.

I'm not entirely certain where the idea that Intel would brand kentsfield as core 2 quadro got started - purrhaps with TomsHardware deciding that they needed to give kentsfield an appealing name in their preview.

Either way, I severely doubt that intel's marketing/branding department would have ever considered naming a product the same as another company's product that exists in the same market. (The market in question being computer components.) After all, can't have someone looking at a workstation and see quadro in the description and hence assume it has nvidia graphics.